Glucose sensor



FIG. 1 is a top view of a glucose sensor, showing our new design;

FIG. 2 is top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear end view thereof;

FIG. 5 is a front end view thereof; and,

FIG. 6 is a right side view thereof, the left side view being a mirror image thereof. 

The ornamental design for a glucose sensor, as shown and described. 